Titanium alloy melting consumable electrode welding method

Abstract

The present invention relates to the field of titanium alloy smelting, and specifically to a consumable electrode welding method for titanium alloy smelting, comprising the following steps: electrode preparation and processing: taking an upper electrode and a lower electrode, and processing a groove on the middle part of the end surface of one end of the lower electrode; assembling: placing the lower electrode into the middle part of the bottom pad, with the end of the lower electrode provided with the groove facing upward, and then placing one end of the upper electrode into the groove of the lower electrode; sleeve a crucible on the outside of the upper electrode and the lower electrode, and connect the bottom of the crucible with the bottom pad; use a fixing tool to limit and fix the upper electrode and the lower electrode; transfer: transfer the crucible to the furnace sleeve; remove the fixing tool; welding: weld the bottom of the upper electrode and the top of the lower electrode. This solution solves the problem of welding voids and loose welding when welding the upper and lower electrodes.

Description

Technical Field

[0001] The invention relates to the field of titanium alloy smelting, and in particular to a consumable electrode welding method for titanium alloy smelting. Background Art

[0002] In the prior art, titanium alloy is melted into an ingot by placing a titanium alloy electrode into a crucible for melting. The electrode in the crucible is welded by multiple sections, wherein the consumable electrode is welded below the auxiliary electrode. The welding of the consumable electrode and the auxiliary electrode is called head welding. When multiple consumable electrodes are needed to melt into an ingot, multiple consumable electrodes need to be welded together. The welding of multiple consumable electrodes is called middle welding.

[0003] When welding in the middle, the two adjacent electrodes are named upper electrode and lower electrode respectively. The welding method is: put the upper and lower electrodes in the center of the bottom pad in the order of up and down, then put the crucible on the outside of the upper and lower electrodes, connect the bottom pad and the bottom of the crucible, and then hang the crucible into the furnace jacket. During welding, the contact part of the bottom of the upper electrode and the top of the lower electrode melts into welding liquid. After the welding liquid solidifies, the bottom of the upper electrode and the top of the lower electrode are welded together.

[0004] However, the molten welding liquid will flow around the top of the lower electrode, and because the welding is carried out in a crucible, the welding position is far away from the mouth of the crucible, the light is poor, it is not easy to observe the welding effect, and it is not easy to control the welding, which makes it easy for welds to be hollow, thereby affecting the stability and firmness of the welding. In this way, in subsequent operations or the formal smelting process, the lower electrode may fall off the upper electrode, affecting the entire smelting process and making the smelted ingot unqualified. Titanium alloy is relatively expensive, and the fall of the lower electrode makes the ingot production unqualified. The ingot can only be downgraded for use, resulting in a large loss.

[0005] At the same time, when the crucible is hoisted into the furnace jacket, due to the gap between the electrode and the inner wall of the crucible, the electrode will be displaced in the crucible, so that the upper electrode and the lower electrode are not located in the middle of the crucible, and the distance between the outer wall of the electrode and the inner wall of the crucible is not equal. At the same time, the displacement of the upper and lower electrodes makes it impossible for the upper and lower electrodes to be aligned. This will affect the subsequent smelting process and the quality of smelting. Therefore, in the prior art, in order to make the upper and lower electrodes located in the middle of the crucible before welding, after the crucible is hoisted into the furnace jacket, it is necessary to check and adjust the position of the upper and lower electrodes in the crucible. Since the upper and lower electrodes are large in size and heavy in weight, it is troublesome and laborious to adjust the position of the upper and lower electrodes (for example, it is necessary to use a crowbar to adjust the position of the upper and lower electrodes). The operation is not only inconvenient, but also the accuracy of the adjustment of the position of the upper and lower electrodes is difficult to control. Summary of the invention

[0006] The invention aims to provide a titanium alloy smelting consumable electrode welding method to solve the problem of weld voids and loose welding when welding upper and lower electrodes.

[0007] To achieve the above object, the present invention adopts the following technical scheme: a titanium alloy smelting consumable electrode welding method, comprising the following steps:

[0008] Electrode preparation and processing: Take the upper electrode and the lower electrode, and process a groove in the middle of the end surface of one end of the lower electrode;

[0009] Assembly: Place the lower electrode into the middle of the bottom pad, with the end of the lower electrode with the groove facing upwards, and then place one end of the upper electrode into the groove of the lower electrode; put the crucible on the outside of the upper and lower electrodes, and connect the bottom of the crucible to the bottom pad; use a fixing tool to limit and fix the upper and lower electrodes;

[0010] Transfer: transfer the crucible into the furnace jacket; and remove the fixing tool from the crucible;

[0011] Welding: Weld the bottom of the upper electrode and the top of the lower electrode.

[0012] The principle and advantage of this solution are: by processing a groove on the top of the lower electrode, before welding, the bottom of the upper electrode is inserted into the groove of the lower electrode. During welding, the molten welding liquid will remain in the groove, and the welding liquid will not flow around due to the limitation of the groove, so that the bottom of the upper electrode and the top of the lower electrode can have sufficient welding liquid contact, and the welding point of the lower and upper electrodes is in a full welding state, avoiding the problem of welding voids, making the welding of the upper and lower electrodes more firm and stable, reducing welding defects, improving welding quality, and the upper and lower electrodes are not easy to fall off.

[0013] At the same time, the welding liquid rarely flows around in the groove to form weld nodules on the surface of the lower electrode, so that there are fewer weld nodules on the surface of the lower electrode, reducing the workload of later detection and cleaning of weld nodules.

[0014] In addition, the solution can prevent the electrode from shifting in the crucible during the transfer of the crucible by limiting the position of the electrode with a fixing tool. After the crucible is transferred, the fixing tool can be taken out of the crucible, and the electrode will still be located in the middle of the crucible. Compared with the existing technology, the electrode will not shift, which greatly reduces the need to adjust the position of the bulky electrode later, and the operation is simple and convenient.

[0015] Preferably, as an improvement, the upper electrode and the lower electrode are both cylindrical, and the groove is a circular groove. The groove is set to be circular, and the upper electrode and the lower electrode are also both cylindrical. Compared with square, diamond or other polygonal shapes, when the upper electrode and the lower electrode are assembled, there is no need to rotate and center the upper electrode and the lower electrode, and it is easier to insert the bottom of the upper electrode into the groove.

[0016] Preferably, as an improvement, during the electrode preparation and processing steps, a receiving groove is processed at the bottom of the groove.

[0017] Therefore, before welding, a receiving groove is first processed at the bottom of the lower electrode groove, so that when welding, the welding liquid melts and enters the receiving groove. The receiving groove receives the welding liquid, which can lower the liquid level of the welding liquid and prevent the welding liquid from overflowing upward from the groove, so that the top of the solidified part of the welding liquid after solidification is lower than the top of the groove. At the same time, the solidified part of the welding liquid after solidification extends into the receiving groove, and the solidified part of the welding liquid contacts the inner wall of the receiving groove, thereby increasing the contact area between the solidified part of the welding liquid and the lower electrode, and the connection between the solidified part of the welding liquid and the lower electrode is relatively firm.

[0018] Preferably, as an improvement, the number of the receiving groove is one and is located in the middle of the groove. Thus, the number of the receiving groove is one and is located in the middle of the groove, which facilitates the processing of the receiving groove. At the same time, the receiving groove is centrally arranged in the groove, which is different from the eccentric arrangement of the receiving groove in the groove after welding. In this way, the solidified part of the solidified welding liquid can be evenly distributed in the groove and the force is evenly applied.

[0019] Preferably, as an improvement, the fixing tool comprises an outer cylinder and a plurality of clamping parts located in the outer cylinder, the plurality of clamping parts are evenly distributed around the center line circumference of the outer cylinder, a telescopic tube is connected between each clamping part and the outer cylinder, a rotating cover is rotatably provided at the top end of the outer cylinder, a plurality of arc grooves are provided on the rotating cover, the plurality of arc grooves are evenly distributed around the center of the rotating cover, one end of the arc groove is close to the center of the rotating cover, and the other end is far from the center of the rotating cover, a control rod is connected to the clamping part, and the control rod is slidably connected in the arc groove;

[0020] In the assembly step, after the bottom of the crucible and the bottom pad are connected, the outer cylinder is placed in the crucible, and then the rotating cover is rotated to move the control rod in the arc groove toward the center of the rotating cover, and the control rod drives the clamping parts to approach each other, and the clamping parts clamp the upper electrode and the lower electrode;

[0021] In the transfer step, after the crucible is transferred to the furnace jacket, the rotating cover is rotated in the opposite direction so that the control rod moves in the arc groove away from the center of the rotating cover. The control rod drives the clamping parts to move away from each other, and the clamping parts release the upper electrode and the lower electrode, and then the fixing tool is taken out of the crucible.

[0022] In this solution, during the assembly step, after the outer tube is placed into the crucible, the outer tube and the clamping part are located between the electrode and the crucible, and the distance between the multiple clamping parts is large, so that the electrode can be smoothly located between the multiple clamping parts. Then, by rotating the rotating cover, the rotating cover causes the position of the arc groove to move, and the control rod moves in the arc groove toward the center of the rotating cover. The control rod drives the clamping parts to approach each other, and the multiple clamping parts clamp the upper electrode and the lower electrode at the same time, thereby achieving the position limitation of the upper electrode and the lower electrode. In this way, when the crucible is transferred, the upper electrode and the lower electrode will not move in the crucible, avoiding the problem that the upper electrode and the lower electrode are displaced and not located in the middle of the crucible. By using the fixed fixture in this solution, the multiple clamping parts move simultaneously to clamp the electrodes at the same time, and the multiple clamping parts contact the electrodes at the same time, avoiding the situation where the order in which the multiple clamping parts contact the electrodes is inconsistent and pushes the electrodes to move in the crucible.

[0023] After the crucible is transferred and stabilized, the rotating cover is rotated in the opposite direction, and the rotating cover drives the arc groove to rotate in the opposite direction. The control rod moves in the arc groove away from the center of the rotating cover, and multiple control rods drive the corresponding clamping parts to move away from each other. The multiple clamping parts release the upper electrode and the lower electrode at the same time, and the clamping parts are no longer in contact with the electrodes. At this time, the fixed tooling is successfully taken out of the crucible.

[0024] In summary, through this solution, before the transfer, the upper and lower electrodes are located in the middle of the crucible. At this time, the electrodes are limited and fixed by the fixing tool, which can prevent the electrodes from shifting in the crucible during the transfer of the crucible. After the crucible is transferred, the fixing tool can be taken out of the crucible, and the electrodes will still be located in the middle of the crucible. Compared with the existing technology, the electrodes will not shift, which greatly reduces the situation of adjusting the position of the bulky electrodes before and after the crucible is transferred, and the operation is simple and convenient.

[0025] When the fixing tool is placed in the crucible in this solution, the clamping part does not contact the electrode, and there can be a gap between the outer wall of the outer tube and the inner wall of the crucible, so that the fixing tool is easily placed in the crucible. The clamping part in this solution can move, so that electrodes of different diameters can be clamped.

[0026] Preferably, as an improvement, a plurality of rotating grooves are provided on the rotating cover, the plurality of rotating grooves are arc-shaped, the plurality of rotating grooves are evenly distributed around the central circumference of the rotating cover, the center of the rotating groove is concentric with the center of the rotating cover, the top end of the outer cylinder is threadedly connected with a tightening bolt, and the tightening bolt vertically passes through the rotating groove;

[0027] In the assembly step, after the clamping part clamps the upper electrode and the lower electrode, the tightening bolts are tightened;

[0028] During the transfer step, first loosen the tightening bolts and then rotate the rotating cover in the opposite direction.

[0029] Therefore, through the cooperation of the rotating groove and the tightening bolt, the rotating cover is limited on the outer cylinder, and the rotating cover will not be separated from the outer cylinder. At the same time, the rotating groove is arc-shaped, and the center of the rotating groove is concentric with the center of the rotating cover. In this way, when the rotating cover rotates, the tightening bolt moves in the rotating groove, the tightening bolt and the rotating groove will not be stuck, and the tightening bolt will not hinder the normal rotation of the rotating cover.

[0030] In the assembly step, after the clamping part clamps the upper electrode and the lower electrode, the tightening bolts are tightened so that the rotating cover does not rotate freely on the outer cylinder, thereby ensuring that the clamping part stably clamps the electrodes in the transfer crucible and does not loosen.

[0031] In the transfer step, the tightening bolts are first loosened so that the rotating cover can rotate freely, thereby enabling the rotating cover to be rotated in the opposite direction.

[0032] Preferably, as an improvement, the top of the outer tube is folded outward to form a folding ear, and an annular groove is provided between the folding ear and the outer tube. After the outer tube is placed in the crucible, the top of the crucible is inserted into the groove. Thus, after the outer tube is placed in the crucible, the top of the crucible is inserted into the groove, the outer tube is located inside the crucible, and the folding ear is located outside the crucible, so that there is a gap between the outer wall of the outer tube and the inner wall of the crucible, and the outer tube can be placed in the crucible more stably.

[0033] Preferably, as an improvement, a positioning groove is processed on the top of the crucible, and an insert is integrally formed on the top of the outer tube. After the outer tube is placed in the crucible, the insert is inserted into the positioning groove. Thus, after the fixing tool is placed in the crucible, the insert is inserted into the positioning groove, so that when the rotating cover is rotated, the outer tube will not rotate on the crucible.

[0034] Preferably, as an improvement, the clamping part includes an upper clamping part and a lower clamping part, and the distance between the lower clamping part and the center line of the outer cylinder is greater than the distance between the upper clamping part and the center line of the outer cylinder. Thus, the upper clamping part clamps the upper electrode, and the lower clamping part clamps the lower electrode. The upper clamping part and the lower clamping part form a step shape, which can clamp the upper and lower electrodes of different diameters, and the clamping of the upper and lower electrodes is more stable.

[0035] Preferably, as an improvement, a viewing hole is provided in the middle of the rotating cover, which facilitates workers to watch the fixing tool being put into the crucible and the clamping of the electrode by the clamping part during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A vertical cross-sectional view of the crucible and the fixing fixture when the fixing fixture is clamping the electrode in the crucible.

[0037] Figure 2 for Figure 1 Top view of the rotating cover.

[0038] Figure 3 for Figure 1 Top view of the middle crucible.

[0039] Figure 4 for Figure 1 A top sectional view of the fixing device in the middle.

[0040] Figure 5 for Figure 1 Bottom view of the middle and outer cylinders.

[0041] Figure 6 for Figure 1 Top view of the middle and outer cylinders. DETAILED DESCRIPTION

[0042] The following is further described in detail through specific implementation methods:

[0043] The figure marks in the drawings of the specification include: crucible 1, bottom pad 2, bolt 3, lower electrode 4, upper electrode 5, lower clamping part 6, upper clamping part 7, telescopic tube 8, outer tube 9, folding ear 10, plug block 11, viewing hole 12, rotating cover 13, clamping block 14, control rod 15, tightening bolt 16, rotating handle 17, connecting rod 18, rotating groove 19, arc groove 20, positioning groove 21, clamping groove 22, threaded hole 23, groove 24, and lifting ear 25.

[0044] Example 1

[0045] Basically as attached Figure 1-Figure 6 As shown: Titanium alloy melting consumable electrode welding method, including the following steps:

[0046] S1, electrode preparation and processing: take the upper electrode 5 and the lower electrode 4, and turn a groove 24 on the middle of the end face of one end of the lower electrode 4; the upper electrode 5 and the lower electrode 4 in this embodiment are both cylindrical, and the groove 24 is a circular groove 24. The diameter of the upper electrode 5 is smaller than the diameter of the groove 24, so that after the upper electrode 5 is placed in the groove 24, there is a gap between the side wall of the upper electrode 5 and the inner wall of the groove 24.

[0047] S2, assembly: put the lower electrode 4 into the middle of the bottom pad 2, the end of the lower electrode 4 without the groove 24 is located on the bottom pad 2, and the end of the lower electrode 4 with the groove 24 is facing upward, and then put one end of the upper electrode 5 into the groove 24 of the lower electrode 4, and the bottom end of the upper electrode 5 is located in the middle of the groove 24. Then lift the crucible 1 and lower it from top to bottom, so that the crucible 1 is sleeved on the outside of the upper electrode 5 and the lower electrode 4, the bottom of the crucible 1 is against the bottom pad 2, and the bottom of the crucible 1 is connected to the bottom pad 2 with bolts 3. There is a gap between the upper electrode 5 and the lower electrode 4 in the crucible 1 and the inner wall of the crucible 1. The gap is generally between 30-100mm. The larger the crucible 1, the larger the gap. In this embodiment, the gap between the lower electrode 4 and the inner wall of the crucible 1 is 50mm.

[0048] In this step, a fixing tool is used to limit and fix the upper electrode 5 and the lower electrode 4; the fixing tool in this embodiment includes an outer cylinder 9 and a plurality of clamping parts located in the outer cylinder 9, combined with Figure 1 , Figure 5 and Figure 6 As shown, the outer cylinder 9 in this embodiment is in the shape of a cylinder, and a folding ear 10 folded outward is integrally formed on the top of the outer cylinder 9, and the folding ear 10 is annular. An annular groove 22 is provided between the folding ear 10 and the outer cylinder 9, and an insert block 11 is integrally formed on the inner wall of the groove 22. There are two insert blocks 11, which are evenly distributed around the central circumference of the outer cylinder 9, and the shape of the insert blocks 11 is cylindrical. Of course, in other embodiments, the number of the insert blocks 11 can also be three, four, etc.

[0049] Combination Figure 1 , Figure 4 As shown, the number of the clamping parts in this embodiment is four, and of course in other embodiments it can also be three, five, etc. The top view shape of the clamping part is arc-shaped, and the four clamping parts are evenly distributed around the center line circumference of the outer cylinder 9. When the four clamping parts are attached together, they can be merged into a circle. The thickness of the outer cylinder 9 and the clamping part can be specifically set according to the gap between the electrode and the inner wall of the crucible 1. For example, when the gap between the lower electrode 4 and the inner wall of the crucible 1 is 50mm, the thickness of the outer cylinder 9 and the thickness of the clamping part can be set to 5mm. A telescopic tube 8 is welded between each clamping part and the inner wall of the outer cylinder 9. The telescopic tube 8 is two tubes sleeved together and slidably connected. A rubber pad is bonded to the side wall of the clamping part away from the outer cylinder 9. The clamping part in this embodiment includes an upper clamping part 7 and a lower clamping part 6. The distance between the lower clamping part 6 and the center line of the outer cylinder 9 is greater than the distance between the upper clamping part 7 and the center line of the outer cylinder 9. The upper clamping part 7 and the lower clamping part 6 are integrally formed, so that the upper clamping part 7 clamps the upper electrode 5 with a smaller diameter, and the lower clamping part 6 clamps the lower electrode 4 with a larger diameter.

[0050] Combination Figure 1 , Figure 2 and Figure 6 As shown, the top end of the outer cylinder 9 is rotatably connected with a circular rotating cover 13. The specific rotation method is: two threaded holes 23 are provided at the top end of the outer cylinder 9 (in other embodiments, the number of threaded holes 23 can also be three, four, etc.), and the two threaded holes 23 are evenly distributed around the central circumference of the outer cylinder 9. Two rotating grooves 19 are provided on the rotating cover 13. The two rotating grooves 19 are both arc-shaped. The two rotating grooves 19 are evenly distributed around the central circumference of the rotating cover 13. The center of the rotating groove 19 is concentric with the center of the rotating cover 13. The rotating cover 13 is covered on the top end of the outer cylinder 9, and the tightening bolt 16 is threadedly connected in the threaded hole 23 at the top end of the outer cylinder 9. The tightening bolt 16 vertically passes through the rotating groove 19. In this embodiment, the part where the tightening thread is located in the rotating groove 19 is a bare rod without thread. Therefore, the rotating cover 13 is located on the top end of the outer cylinder 9 by limiting the tightening thread. By not tightening the tightening bolt 16, the tightening bolt 16 and the rotating groove 19 cooperate, and the rotating cover 13 can rotate on the top end of the outer cylinder 9.

[0051] Combination Figure 1 and Figure 2 As shown, the rotating cover 13 is provided with four arc grooves 20, which are evenly distributed around the center of the rotating cover 13, one end of the arc groove 20 is close to the center of the rotating cover 13, and the other end is far away from the center of the rotating cover 13. A control rod 15 is welded on the clamping part. The control rod 15 in this embodiment is welded on the upper clamping part 7, and the control rod 15 is bent upward. The top end of the control rod 15 is inserted into the arc groove 20 upward and can slide in the arc groove 20. In order to prevent the rotating cover 13 from being separated from the top end of the outer cylinder 9 and to prevent the top end of the control rod 15 from being separated from the arc groove 20, a clamping block 14 is fixed to the top end of the control rod 15 by screws, and the clamping block 14 is against the top of the rotating cover 13, so that the rotating cover 13 will not move upward and separate from the outer cylinder 9 and the control rod 15. In addition, a circular viewing hole 12 is provided in the middle of the rotating cover 13. Meanwhile, an annular rotating handle 17 is provided on the outer side of the rotating cover 13 . The rotating handle 17 and the rotating cover 13 are coaxially arranged. A connecting rod 18 is welded between the rotating handle 17 and the outer side wall of the rotating cover 13 .

[0052] Combination Figure 3 As shown, a positioning groove 21 is processed on the top of the crucible 1 . There are two positioning grooves 21 , and the two positioning grooves 21 are evenly distributed around the central circumference of the crucible 1 .

[0053] In this step, the bottom of the crucible 1 and the bottom pad 2 are connected by bolts 3. Figure 1As shown, the outer cylinder 9 is placed into the crucible 1, and the insert block 11 is inserted into the positioning groove 21 at the top of the crucible 1. Then the rotating cover 13 is rotated clockwise by rotating the handle 17, and the tightening bolt 16 slides relatively in the rotating groove 19. Under the limiting effect of the arc groove 20, the control rod 15 moves in the arc groove 20 toward the center of the rotating cover 13, and the control rod 15 drives the clamping parts to approach each other, and the upper clamping part 7 and the lower clamping part 6 clamp the upper electrode 5 and the lower electrode 4 respectively. After the clamping parts clamp the upper electrode 5 and the lower electrode 4, tighten the tightening bolt 16 so that the head of the tightening bolt 16 is tightly against the top of the rotating cover 13.

[0054] S3, Transfer: Combine Figure 1 and Figure 3 As shown, a lifting lug 25 is fixed on the top of the crucible 1, and a hanging hole is provided on the lifting lug 25. The arrangement of the lifting lug 25 and the hanging hole is convenient for connecting with a hanging rope. The crucible 1 is lifted upward by a crane and the crucible 1 and the electrode are transferred to the furnace jacket together.

[0055] After the transfer is completed, loosen the tightening bolt 16, but do not remove the tightening bolt 16 from the top of the outer cylinder 9. Then rotate the rotating cover 13 counterclockwise, and the control rod 15 moves under the limit of the arc groove 20. The control rod 15 moves in the arc groove 20 away from the center of the rotating cover 13, and the control rod 15 drives the multiple clamping parts to move away from each other, and the clamping parts release the upper electrode 5 and the lower electrode 4, and then the fixing tool is smoothly taken out of the crucible 1.

[0056] S4, welding: After placing the auxiliary electrode into the crucible 1, the bottom of the upper electrode 5 and the top of the lower electrode 4 are welded. During welding, the contact portion of the upper electrode 5 and the lower electrode 4 melts, and the molten welding liquid will remain in the groove 24. The welding liquid will not flow around under the limitation of the groove 24, so that the bottom of the upper electrode 5 and the top of the lower electrode 4 can have sufficient welding liquid contact, and the welding point of the lower electrode 4 and the upper electrode 5 is in a full welding state, avoiding the problem of welding voids, making the welding of the upper electrode 5 and the lower electrode 4 more firm and stable, reducing welding defects, improving welding quality, and the upper electrode 5 and the lower electrode 4 are not easy to fall off.

[0057] In addition, through this embodiment, the fixing tool is used to limit and fix the electrode before the transfer, and the fixing tool is taken out after the transfer, so that the upper electrode 5 and the lower electrode 4 will not be offset in the crucible 1, and the upper electrode 5 and the lower electrode 4 can be in a centered state, which can ensure the uniform welding of the upper electrode 5 and the lower electrode 4. At the same time, the upper electrode 5 and the lower electrode 4 are also located in the middle of the crucible 1, which can ensure the quality of smelting.

[0058] Example 2

[0059] In this embodiment, in the S1 electrode preparation and processing steps, a receiving groove is processed at the bottom of the groove 24. There is one receiving groove, and it is located in the middle of the groove 24. Therefore, when welding, the solder liquid melts and enters the receiving groove. The receiving groove receives the solder liquid, which can lower the liquid level of the solder liquid and prevent the solder liquid from overflowing upward from the groove 24, so that the top of the solidified portion of the solder liquid after solidification is lower than the top of the groove 24. At the same time, the solidified portion of the solder liquid after solidification extends into the receiving groove, and the solidified portion of the solder liquid contacts the inner wall of the receiving groove, thereby increasing the contact area between the solidified portion of the solder liquid and the lower electrode 4, and the solidified portion of the solder liquid and the lower electrode 4 are more firmly connected.

[0060] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Titanium alloy smelting consumable electrode welding method, characterized by: The following steps are involved: Electrode preparation and processing: Take the upper electrode and the lower electrode, and process a groove in the middle of the end surface of one end of the lower electrode; Assembly: Place the lower electrode into the middle of the bottom pad, with the end of the lower electrode with the groove facing upwards, and then place one end of the upper electrode into the groove of the lower electrode; put the crucible on the outside of the upper and lower electrodes, and connect the bottom of the crucible to the bottom pad; use a fixing tool to limit and fix the upper and lower electrodes; Transfer: transfer the crucible into the furnace jacket; and remove the fixing tool from the crucible; Welding: weld the bottom of the upper electrode and the top of the lower electrode; The fixing fixture comprises an outer cylinder and a plurality of clamping parts located in the outer cylinder, the plurality of clamping parts are evenly distributed around the center line circumference of the outer cylinder, a telescopic tube is connected between each clamping part and the outer cylinder, a rotating cover is rotatably arranged at the top end of the outer cylinder, a plurality of arc grooves are arranged on the rotating cover, the plurality of arc grooves are evenly distributed around the center of the rotating cover, one end of the arc groove is close to the center of the rotating cover, and the other end is far from the center of the rotating cover, a control rod is connected to the clamping part, and the control rod is slidably connected in the arc groove; In the assembly step, after the bottom of the crucible and the bottom pad are connected, the outer cylinder is placed in the crucible, and then the rotating cover is rotated to move the control rod in the arc groove toward the center of the rotating cover, and the control rod drives the clamping parts to approach each other, and the clamping parts clamp the upper electrode and the lower electrode; In the transfer step, after the crucible is transferred to the furnace jacket, the rotating cover is rotated in the opposite direction so that the control rod moves in the arc groove away from the center of the rotating cover. The control rod drives the clamping parts to move away from each other, and the clamping parts release the upper electrode and the lower electrode, and then the fixing tool is taken out of the crucible.

2. The titanium alloy smelting consumable electrode welding method according to claim 1, characterized in that: The upper electrode and the lower electrode are both cylindrical, the groove is a circular groove, and the diameter of the groove is greater than the diameter of the upper electrode.

3. The titanium alloy smelting consumable electrode welding method according to claim 1, characterized in that: During the electrode preparation and processing steps, a receiving groove is processed at the bottom of the groove.

4. The titanium alloy smelting consumable electrode welding method according to claim 3, characterized in that: The number of the accommodating groove is one and the accommodating groove is located in the middle of the groove.

5. The titanium alloy smelting consumable electrode welding method according to claim 1, characterized in that: The rotating cover is provided with a plurality of rotating grooves, all of which are arc-shaped and evenly distributed around the central circumference of the rotating cover, and the center of the rotating groove is concentric with the center of the rotating cover. The top end of the outer cylinder is threadedly connected with a tightening bolt, and the tightening bolt vertically passes through the rotating groove; In the assembly step, after the clamping part clamps the upper electrode and the lower electrode, the tightening bolts are tightened; During the transfer step, first loosen the tightening bolts and then rotate the rotating cover in the opposite direction.

6. The titanium alloy smelting consumable electrode welding method according to claim 1, characterized in that: The top of the outer tube is folded outward to form a folded ear, and an annular clamping groove is provided between the folded ear and the outer tube. After the outer tube is placed in the crucible, the top of the crucible is clamped into the clamping groove.

7. The titanium alloy smelting consumable electrode welding method according to claim 1, characterized in that: A positioning groove is processed on the top of the crucible, and an insert block is integrally formed on the top of the outer cylinder. After the outer cylinder is placed in the crucible, the insert block is inserted into the positioning groove.

8. The titanium alloy smelting consumable electrode welding method according to claim 1, characterized in that: The clamping part comprises an upper clamping part and a lower clamping part, and the distance from the lower clamping part to the center line of the outer cylinder is greater than the distance from the upper clamping part to the center line of the outer cylinder.

9. The titanium alloy smelting consumable electrode welding method according to claim 1, characterized in that: A viewing hole is arranged in the middle of the rotating cover.

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